CN110468243B - 100% adding tamping coke high-smelting-strength production process for large-scale blast furnace - Google Patents
100% adding tamping coke high-smelting-strength production process for large-scale blast furnace Download PDFInfo
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- 239000000571 coke Substances 0.000 title claims abstract description 101
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 44
- 239000003245 coal Substances 0.000 claims abstract description 115
- 238000002156 mixing Methods 0.000 claims abstract description 29
- 238000000034 method Methods 0.000 claims abstract description 6
- 238000003763 carbonization Methods 0.000 claims abstract description 5
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 36
- 238000006243 chemical reaction Methods 0.000 claims description 26
- 238000004939 coking Methods 0.000 claims description 20
- 238000012360 testing method Methods 0.000 claims description 20
- 229910052742 iron Inorganic materials 0.000 claims description 18
- 238000010438 heat treatment Methods 0.000 claims description 12
- 239000000463 material Substances 0.000 claims description 9
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims description 8
- 229910052593 corundum Inorganic materials 0.000 claims description 8
- 229910001845 yogo sapphire Inorganic materials 0.000 claims description 8
- 239000002994 raw material Substances 0.000 claims description 6
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 claims description 4
- 238000007664 blowing Methods 0.000 claims description 4
- 238000002485 combustion reaction Methods 0.000 claims description 4
- 229910052717 sulfur Inorganic materials 0.000 claims description 4
- 239000011593 sulfur Substances 0.000 claims description 4
- 230000008569 process Effects 0.000 claims description 2
- 239000002184 metal Substances 0.000 claims 1
- 229910052751 metal Inorganic materials 0.000 claims 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 abstract description 6
- 229910052760 oxygen Inorganic materials 0.000 abstract description 6
- 239000001301 oxygen Substances 0.000 abstract description 6
- 239000000446 fuel Substances 0.000 abstract description 5
- 230000008901 benefit Effects 0.000 abstract description 2
- 239000007789 gas Substances 0.000 description 9
- 239000003337 fertilizer Substances 0.000 description 4
- 230000009257 reactivity Effects 0.000 description 4
- 230000008859 change Effects 0.000 description 3
- 238000001514 detection method Methods 0.000 description 3
- 238000002474 experimental method Methods 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000011156 evaluation Methods 0.000 description 2
- 230000036541 health Effects 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 238000010791 quenching Methods 0.000 description 2
- 230000000171 quenching effect Effects 0.000 description 2
- 238000011160 research Methods 0.000 description 2
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B5/00—Making pig-iron in the blast furnace
- C21B5/007—Conditions of the cokes or characterised by the cokes used
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Abstract
The invention relates to a 100% adding drum-tamping coke high-metallurgical-strength production process for a large-scale blast furnace. The production process comprises the following steps: 1) blending coal; 2) according to the coal blending structure in the step 1), tamping the blended coal and then pushing the tamped blended coal into a carbonization chamber to be milled into coke; 3) the coke prepared in the step 2) is used for blast furnace production. The production process realizes the blast furnace high metallurgical strength production of 1080m coke under the condition of 100 percent of tamping coke feeding3The daily output of the blast furnace is improved from 3900t to 4050t under the condition of 4 percent of oxygen enrichment rate, the comprehensive coke ratio is reduced from 500kg/t to 495kg/t, the fuel cost of the blast furnace under the condition of high metallurgical strength is greatly reduced, and the method has great economic benefit.
Description
Technical Field
The invention relates to a high metallurgical strength production process for 100% tamping coke of a large-scale blast furnace.
Background
The tamping coke is a coking technology which can mix more high volatile coal and weak caking coal according to different purposes of coke, tamp the mixed coal in a coal box of a coal charging coke pusher by a tamping machine, and push the coal into a coking chamber from a coke oven side for high-temperature carbonization. The mature coke is pushed out from the carbonization chamber by a tamping coke pusher, is sent to a coke quenching tower by a coke guide and a coke quenching car, is put on a coke cooling platform after being extinguished by water or nitrogen, and is conveyed by an adhesive tape and is separated into product coke with different grain sizes by a coke screening.
Before the coke reaches the tuyere zone in the blast furnace, the coke is mixed with CO2The reaction generated CO is at 800-1400 ℃, the reactivity and the post-reaction strength of the metallurgical coke at present are tested according to GB/T4000 Experimental method for the reactivity and the post-reaction strength of the coke, the method is derived from a new-day iron experiment, namely 10kg of representative coke with the granularity of more than 25mm is taken and is tested under the condition of 1100 ℃ after being crushed for three times; in the international sample preparation method, a sample from which furnace end coke and bubble coke are removed manually is added, and the test is carried out at 1100 ℃. With international plate change and reform, the difference between a sample preparation method and experimental conditions and that of new-day iron is larger and larger, and more researches show that the actual behavior of coke in a furnace can not be accurately reflected by the conventional experimental method for reactivity and post-reaction strength of coke, and the actual guidance requirement of a blast furnace on coke quality indexes is higher especially under the current conditions of large oxygen enrichment and high metallurgical strength production.
At present, the metallurgical coke index is implemented according to GB/T1996-2017 metallurgical coke, the standard mainly defines the index and grade classification of top charging coke, and the determination of the reactivity (CRI) and the strength after reaction (CSR) is carried out according to the regulation of the GB/T4000. The theoretical combustion temperature in front of the blast furnace tuyere is up to 2200 ℃ or above, and the temperature is still over 1200 ℃ in the coke material column area along with the reduction reaction and the heat exchange. Therefore, the GB/T4000 detection standard cannot reflect the strength requirement index of the coke after reaction in the blast furnace, in addition, the physical and chemical properties of the tamping coke and the top-charging coke and the degradation process of the blast furnace have certain difference, and the evaluation standard of the top-charging coke and the influence value of the evaluation standard on various technical and economic indexes of the blast furnace are not suitable for the tamping coke any more, so the GB/T4000 detection standard has a weak guiding effect on the production of the tamping coke in a large-scale blast furnace.
According to the invention, through the research of the high metallurgical strength production process, the high metallurgical strength production of the large-scale blast furnace effectively served by the 1200 ℃ hot strength index of the tamping coke is realized. The actual demand that the blast furnace can not meet the high metallurgical strength production according to the original detection standard is avoided.
Disclosure of Invention
The invention provides a 100% tamping coke high-smelting-strength production process of a large-scale blast furnace in order to make up for the defects of the prior art, and solves the problems in the prior art.
The invention is realized by the following technical scheme:
a100% allocation tamping coke high-smelting-strength production process of a large-scale blast furnace comprises the following steps: the strength of the product after reaction at 1200 ℃ reaches 39 percent.
The 100% tamping coke high-smelting-strength production process for the large-scale blast furnace comprises the following steps:
1) blending coal
Optimizing a coal blending structure: the proportion of coking coal is controlled to be more than or equal to 36 percent, the proportion of economic coal is controlled to be less than or equal to 30 percent, and the strength of the coke after 1200 ℃ reaction reaches 39 percent;
2) according to the optimized coal blending structure in the step 1), tamping the blended coal and then pushing the tamped blended coal into a carbonization chamber to be milled into coke;
3) using the coke obtained in the step 2) for blast furnace production, and guiding the blast furnace to carry out the following operation adjustment: blast furnace (1080 m)3Class) pressure difference in furnace<175kPa, the blowing kinetic energy is controlled at 8000-.
In the step 3), when the coke quality does not reach the standard>At 48h, controlling MgO/Al2O3Push button>0.58 execution, and after the quality is recovered to the standard requirement for 72 hours, controlling the MgO/Al2O3Reduced to below 0.55;
the economic coal is gas coal, lean coal or 1/3 coking coal.
Preferably, the economic coal is gas coal or lean coal.
The operation steps of the step 1) for optimizing the coal blending structure comprise:
a. preparing a drawing of main quality indexes of coal types entering a factory, and selecting raw materials with stable quality indexes of various coal types;
b. carrying out 'iron box test' on focused and fat coal key coal types, and judging the coking performance of the coal types; optimally adjusting the proportion of each coal to be added until the strength of the coke reaches 39 percent after reaction at 1200 ℃;
c. heating the coal material at a heating rate of 3 ℃/min between the temperature ranges of 200 ℃ and 500 ℃, and controlling the heating rate of the coal material at 1-1.5 ℃/min between the temperature ranges of 500 ℃ and 700 ℃.
The main quality indexes of the coal in the step a comprise a G value, an ash content, a sulfur content and a Y value.
The production process is applied to 100% tamping drum coke high-metallurgical-strength production of a large-scale blast furnace.
The invention has the beneficial effects that:
the 100% tamping coke high-smelting-strength production process of the large-scale blast furnace realizes the high-smelting-strength production of the blast furnace under the condition that 100% tamping coke is fed into the furnace, and the production process is 1080m3The daily output of the blast furnace is improved from 3900t to 4050t under the condition of 4 percent of oxygen enrichment rate, the comprehensive coke ratio is reduced from 500kg/t to 495kg/t, the fuel cost of the blast furnace under the condition of high metallurgical strength is greatly reduced, and the method has great economic benefit.
Drawings
FIG. 1 is a process flow diagram of the present invention.
Detailed Description
In order to clearly illustrate the technical features of the present invention, the present invention is explained in detail by the following embodiments.
Example one
1080m3The 100% charging tamping coke high-smelting-strength production process of the grade blast furnace comprises the following steps:
first, blending coal
1.1, making a trend chart for main quality indexes of coal types entering a factory, such as G value, ash content, sulfur content, Y value and the like, and selecting the coal types according to the index trends of the coal types, namely selecting raw materials with stable quality index change trends and better quality of the coal types compared with the standard index requirements of the coal types; the raw materials are specifically selected as shown in the following table 1:
TABLE 1
1.2 iron box test
According to a coal blending scheme of 38% of coking coal, 11% of fat coal, 28% of gas coal, 11% of 1/3 coking coal and 12% of lean coal, an iron box test is carried out.
The purpose of the iron box test is that in actual production, due to fluctuation of coal indexes, the strength index of the coke obtained according to the coal blending scheme after reaction may have the problem of surplus or shortage, and the iron box test can further and reasonably adjust the coal blending structure before blast furnace production.
The mixed coal is firstly coked through an iron box test to obtain a strength index of the coke with a coal blending ratio after the reaction at 1200 ℃, and the test result is that the strength of the coke after the reaction at 1200 ℃ is 39.5 percent, the requirement of exceeding the index by 39 percent is less, the strength index after the reaction is not greatly different, lean and lean coal is properly added according to the blending ratio of 0.5 percent, and the strength after the reaction at 1200 ℃ is adjusted to 39 percent in an optimized mode.
1.3 heating the coal material at a heating rate of 3 ℃/min between the temperature ranges of 200 ℃ and 500 ℃, and controlling the heating rate of the coal material at 1-1.5 ℃/min between the temperature ranges of 500 ℃ and 700 ℃; reducing the radial gradient of coal pillars, reducing the generation of internal cracks of coke, enabling the coke to be uniform and mature, homogenizing the particle size and completing the iron box test.
The coal blending scheme obtained by the iron box test has the following coal proportions: 37.5% of coking coal, 11% of fat coal, 28% of gas coal, 11% of 1/3 coking coal and 12.5% of lean coal.
Secondly, coking according to the coal blending ratio obtained in the first step to obtain coke;
thirdly, the coke obtained from the second step is used for blast furnace production, and the following operation adjustment is guided to the blast furnace according to the control standard of the blast furnace health operation parameters: blast furnace (1080 m)3Class) pressure difference in furnace<175kPa, the blowing kinetic energy is controlled to be 8000-8500 kg/m/s, and the theoretical combustion temperature in front of an air port is 2250-2350 ℃;
when the coke quality does not reach the standard>At 48h, controlling MgO/Al2O3Push button>0.58 execution, and after the quality is recovered to the standard requirement for 72 hours, controlling the MgO/Al2O3And is reduced to below 0.55.
1080m of high metallurgical production of the blast furnace3The oxygen enrichment rate of the blast furnace is 4 percent, the daily output is improved to 4050t, and the total yield is increasedThe coke ratio is reduced to 495kg/t, and the fuel cost under the high-metallurgical-strength production condition of the blast furnace is greatly reduced.
Example 2
1080m3The 100% charging tamping coke high-smelting-strength production process of the grade blast furnace comprises the following steps:
first, blending coal
1.1, making a trend chart for main quality indexes of coal types entering a factory, such as G value, ash content, sulfur content, Y value and the like, and selecting the coal types according to the index trends of the coal types, namely selecting raw materials with stable quality index change trends and better quality of the coal types compared with the standard index requirements of the coal types; the raw materials are specifically selected as shown in the following table 2:
TABLE 2
The coal blending scheme used in the present example is: if the coke is blended according to the standard coal types, the expected coke can be obtained according to the case 1, but the single and stable coal types cannot be ensured in the actual production, and the coal blending scheme is prepared for A, B: 17.5 percent of coke A, 20 percent of coke B, 2 percent of fertilizer A, 9 percent of fertilizer B, 8.5 percent of gas A, 19.5 percent of gas B, 6 percent of 1/3 coke A, 5 percent of 1/3 coke B, 7.5 percent of lean A and 5 percent of lean B.
1.2 iron box test
And (4) carrying out an iron box test according to the coal blending scheme.
The purpose of the iron box test is that in actual production, due to fluctuation of coal indexes, the strength index of the coke obtained according to the coal blending scheme after reaction may have the problem of surplus or shortage, and the iron box test can further and reasonably adjust the coal blending structure before blast furnace production.
Firstly, the mixed coal is coked through an iron box test to obtain a strength index of the coke with a coal blending ratio after 1200 ℃ reaction, and the test result is that the strength of the coke after 1200 ℃ reaction is 43 percent and the requirement of exceeding the index by 39 percent is more, which indicates that the strength index after the reaction is excessive (generally, the strength of the coke after 1200 ℃ reaction is more than 40 percent and is adjusted according to the excessive index), and optimization adjustment is needed. Specifically, the method comprises the following steps: the proportion of main coal type coking coal is adjusted firstly, the strength index is reduced after the coke reacts at 1200 ℃, and the coking coal A is gradually replaced and transited into the coking coal B according to the 2 percent replacement proportion. The G value is greatly reduced after replacement, the strength index of the coke after reaction is 38 percent and is lower than the control standard, the coking coal A with high Y value is added according to the proportion of 0.5 percent, and the strength is adjusted up twice until the strength is stabilized at about 40 percent after the coke reaction. And then, adjusting the proportion of the fat coal B point by point (1%), increasing the proportion of the gas coal A to be added until the strength of the coke reaches 39.5% after the reaction at 1200 ℃, achieving the effect that the strength is closer to 39%, continuously adjusting according to the adjustment amount of 1%, and ending the adjustment until the strength of the coke reaches 39% after the reaction at 1200 ℃.
1.3 heating the coal material at a heating rate of 3 ℃/min between the temperature ranges of 200 ℃ and 500 ℃, and controlling the heating rate of the coal material at 1-1.5 ℃/min between the temperature ranges of 500 ℃ and 700 ℃; reducing the radial gradient of coal pillars, reducing the generation of internal cracks of coke, enabling the coke to be uniform and mature, homogenizing the particle size and completing the iron box test.
The coal blending scheme obtained by the iron box test has the following coal proportions: 16% of coke A, 21% of coke B, 2% of fertilizer A, 8% of fertilizer B, 9.5% of gas A, 19.5% of gas B, 6% of 1/3 coke A, 5% of 1/3 coke B, 8% of lean A and 5% of lean B.
Secondly, coking according to the coal blending ratio obtained in the first step;
thirdly, the coke obtained from the second step is used for blast furnace production, and the following operation adjustment is guided to the blast furnace according to the control standard of the blast furnace health operation parameters: blast furnace (1080 m)3Class) pressure difference in furnace<175kPa, the blowing kinetic energy is controlled to be 8000-8500 kg/m/s, and the theoretical combustion temperature in front of an air port is 2250-2350 ℃;
when the coke quality does not reach the standard>At 48h, controlling MgO/Al2O3Push button>0.58 execution, and after the quality is recovered to the standard requirement for 72 hours, controlling the MgO/Al2O3And is reduced to below 0.55.
1080m of high metallurgical production of the blast furnace3The daily yield is increased under the condition that the oxygen enrichment rate of the blast furnace is 4 percentThe total coke ratio is reduced to 494kg/t when the total coke ratio is up to 4051t, and the fuel cost under the high-metallurgical-strength production condition of the blast furnace is greatly reduced.
High metallurgical strength production of tamping coke blast furnace according to the requirements of the existing top-charging coke standard, 1080m3The daily output of the blast furnace is 3900t and the comprehensive coke ratio is 500kg/t under the condition of 4 percent of oxygen enrichment rate, compared with the scheme, the indexes are greatly different, and the fuel cost of the blast furnace under the high-metallurgical-strength production condition is greatly improved.
The scheme of the invention has good guiding significance for 100 percent of tamping coke high-metallurgical-strength production of the large-scale blast furnace.
The above-described embodiments should not be construed as limiting the scope of the invention, and any alternative modifications or alterations to the embodiments of the present invention will be apparent to those skilled in the art.
The present invention is not described in detail, but is known to those skilled in the art.
Claims (3)
1. The 100% allocation tamping coke high-smelting-strength production process of the large-scale blast furnace is characterized in that the index standard of coke for the process is as follows: the strength reaches 39% after the reaction at 1200 ℃;
the operation steps for optimizing the coal blending structure comprise:
a. preparing a drawing of main quality indexes of coal types entering a factory, and selecting raw materials with stable quality indexes of various coal types;
b. carrying out a 'hot metal box test' on the focused and fat coal, judging the coking performance of the coal, and optimally adjusting the blending proportion of the coking coal and the economic coal according to the reference consumption that the blending proportion of the coking coal is more than or equal to 36 percent and the proportion of the economic coal is less than or equal to 30 percent until the strength reaches 39 percent after the reaction at 1200 ℃ of the coke;
c. heating the coal material at a heating rate of 3 ℃/min between the temperature ranges of 200 ℃ and 500 ℃, and controlling the heating rate of the coal material at 1-1.5 ℃/min between the temperature ranges of 500 ℃ and 700 ℃;
the production process comprises the following steps:
1) blending coal
Optimizing a coal blending structure: the proportion of coking coal is controlled to be more than or equal to 36 percent, the proportion of economic coal is controlled to be less than or equal to 30 percent, and the strength of coke after 1200 ℃ reaction reaches 39 percent through an iron box test;
2) according to the optimized coal blending structure in the step 1), tamping the blended coal and then pushing the tamped blended coal into a carbonization chamber to be milled into coke;
3) using the coke prepared in the step 2) for blast furnace production, and guiding the blast furnace to carry out the following operation adjustment: 1080m3Differential pressure in blast furnace<175kPa, the blowing kinetic energy is controlled to be 8000-8500 kg/m/s, and the theoretical combustion temperature in front of an air port is 2250-2350 ℃;
step 3) in the blast furnace production process, when the coke quality does not reach the standard>At 48h, controlling MgO/Al2O3Push button>0.58 execution, and after the quality is recovered to the standard requirement for 72 hours, controlling the MgO/Al2O3And is reduced to below 0.55.
2. The production process according to claim 1, characterized in that: the economic coal is gas coal, lean coal or 1/3 coking coal.
3. The production process according to claim 1, characterized in that: the main quality indexes of the coal in the step a comprise a G value, an ash content, a sulfur content and a Y value.
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| CN101942315A (en) * | 2010-08-16 | 2011-01-12 | 中国神华能源股份有限公司 | High-proportion coal blending and coking method |
| CN103468289A (en) * | 2013-09-27 | 2013-12-25 | 武汉科技大学 | Iron coke for blast furnace and preparing method thereof |
| CN106118702A (en) * | 2016-08-16 | 2016-11-16 | 武汉钢铁股份有限公司 | Reduce the blending method of coke initial reaction temperature |
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| CN101942315A (en) * | 2010-08-16 | 2011-01-12 | 中国神华能源股份有限公司 | High-proportion coal blending and coking method |
| CN103468289A (en) * | 2013-09-27 | 2013-12-25 | 武汉科技大学 | Iron coke for blast furnace and preparing method thereof |
| CN106118702A (en) * | 2016-08-16 | 2016-11-16 | 武汉钢铁股份有限公司 | Reduce the blending method of coke initial reaction temperature |
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Application publication date: 20191119 Assignee: XINJIANG KUNYU STEEL Co.,Ltd. Assignor: SHIHENG SPECIAL STEEL GROUP Co.,Ltd. Contract record no.: X2022980027050 Denomination of invention: A high smelting strength production process with 100% tamping coke for large blast furnace Granted publication date: 20210813 License type: Common License Record date: 20230105 |
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Denomination of invention: A High Metallurgical Strength Production Process with 100% Stamping Coke for Large Blast Furnace Effective date of registration: 20231222 Granted publication date: 20210813 Pledgee: Industrial and Commercial Bank of China Limited Feicheng sub branch Pledgor: SHIHENG SPECIAL STEEL GROUP Co.,Ltd. Registration number: Y2023980073806 |